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| Regardless of the source or kind of
light, the ability of light to form an image is dependent upon just one thing--a
small hole or a lens to bring the rays to a focus. The principle of image
formation was discovered in early Greek Times. Later it was realized that the
eye itself has a lens and that an image is, in fact, formed on the retina, the
rear inside surface of the eyeball. Some man inside a cave or a darkened room
noticed that light entering through a small hole in the wall formed an image on
the far wall. It was observed that if you enlarge the hole, the image blurred
and disappeared. On the other hand, the smaller the hole, the sharper the
image-down to a certain diameter after which making the hole smaller makes the
image worse again. The function of a pinhole is to screen out all light rays except those coming in a p A. Modern Lenses B. The Modern Camera C. Lenses and Image Formation D. Development in Photography [单项选择]Passage Four
There is a measurable relation between how much a person learns and his attitude toward the subject to be learned. When faced with a difficult learning task, one path to success is to concentrate on the positive aspects of the subject matter. If a student has a boring teacher, one solution is to look for the positive aspects of completing the course, regardless of how boring the teacher happens to be. To accomplish this might require a private tutor or some independent reading, but with the right attitude, success is possible.
Over-achievers – students who do better than their test scores show – usually have a positive interest toward learning. They may learn some things more slowly, and they may make more efforts, but, to compensate (补偿), they are often better at applying what they have learned. As long as they do not have emotional problems, they are successful.
Under-achievers – those who function below their ability shown by test scored – often ten
A. often get low scores in tests B. do worse in actual learning than in tests C. usually do better in tests than the over-achievers D. are always slow in learning and have to make more efforts 我来回答: 提交
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